Diazoamino compounds



Patented June 17, 1947 DIAZOAMINO COMPOUNDS Carl W. Maynard, Jr., and Emil G. Wiest, Wilmington, DeL, asslgnors to E. I. du Pont de Nemours & Company, Wilmington, Del., a corporation of Delaware No Drawing. Original application August 7, 1942,

Serial No. 454.018. Divided and this application October 29, 1943, Serial N 0. 508,244

Claims. (Cl. 260-140) This invention relates to the dyeing of textile fibers with insoluble azo dyes, and especially to new water-soluble diazoamino compounds which are stable in alkaline medium but which regenerpounds has now been discovered which is represented in general by the formula ate the diazo components thereof in weakly acidic 5 medium thereby enabling the regenerated dlazo AN-R" compound to couple with suitable azo dye coum pling components to form insoluble azo dyes with- R out forming undesirable combinations with the wherein B is the radical of the dlazotized aryianon-diazo radical of the diazoamino compound. mine which is devoid of water-solubilizing groups The invention also relates to methods of producand condensed with the amkmbenzeneacld'al ing said diazoamino compounds. ylol-amlde; R is one of a group consisting of It is among the objects of the invention to prohydrogen, alkyl having 1 4 carbons, hydroxy' vide new water-soluble diazoamino compounds ethyland tflsmydroxy methynmethyl; A is which are stable in alkaline medium but which when n is and when n is 2 split up in acid medium to form diazo compounds both ac d groups may be fO 1 fl y 0 0 8 which readily couple with azo dye coupling may be sulfon and the other carbox; R. is one of ponents. Another object of the invention is to 5* group consisting ofjlydmgen and ammo] havprovide stabilizers which will operate satisiactorf 1 t0 4 carbons; R is an alkylol radical havily with negatively substituted diazo compounds. mg 1 4 carbons and 1 0 4 hydroxy groups Still other objects of the invention will be appar- K5 223 2 g gg zi gg :23 33: 2:52 g grg fi ent from the following description.

The objects of the invention are attained in fi i f 'f gi ig z g fia $2 3 259 general by providing diazoamino com unds which result from reacting in alkaline med fum a 25 2 of group gg hydrogen suitable diazotized arylamine with an aminobeng g a 1 2 1 zene-acid-alkylol-amide wherein the acid radiggig z fg z fifg az s cal is sulfon, carbox or both. The diazoamino compounds thus produced k be incorporated stabilized azo radical in form similar to the group with a suitable azo dye coupling component into an alkaline hydrous pasty composition which contains sufllcient of a printing paste thickener to I enable the composition to be printed on textile A N R material. By acidification of such a print, the R" diazo component is liberated, coupling ensues and 3 depending on whether the am compound which fi g lirdeveloped the materialis stabilized is derived from a monoor a di-amino comin ii ilfiilii .iiililfffie ifafi fif Z5 arylamine which is devoid of water-soluhilizing 4o mgzfi g z i gi gz a 2 2:5: groups with a primary or secondary aminobenazoamino compound and an azoic dye coupling zene-acid-alkylol-a nide of the class referred to component into a hydrous alkaline paste which and which is substituted by groups such that it contains a sufficient proportion of pasty thickenwill condense rather than couple when it reing agent t enable a print t b i r d on acts in alkaline medium with a diazo compound textile fibers from a print forming d h as that is suitable for making insoluble azoic colors, tm block or etched printing n Hysuch as ice-colors. The resulting diazoamino rated starch, gum tragacanth or a mixture of compounds can be readily split apart in acidic but these thickeners are desirable thickening agents not in alkaline medium to regenerate the diazo for this purpose. A mono alkyl ether of ethylene compound. A class of such diazoamino comglycol, such as the mono ethyl ether of ethylene glycol (Cellosolve) is a desirable constituent of such printing pastes, and more or less of this constituent may be present as a solubilizing agent for the diazoamino compound.

When a print is made on the fabric with the alkaline printing composition, the print is developed by exposing it to an acid medium, such as a vapor-bath consisting of steam and the vapor of an acid, such as formic or acetic acid. until the print is acidified and coupling has been completed. Upon being acidified the diazo compound is regenerated and dyeing of the fiber takes place from the resulting coupling of the diazo compound with the associated coupling component and fiber in the acidified medium.

It has been found that the described class of diazoamino compounds operate in the described manner to develop bright clear shades and the dyeings made thereby are very fast to light and washing.

It has been found further that the aminobenzene-acid-alkylol-amides referred to have the surprising ability to regenerate negatively substituted diazos and to prevent diazo exchange in such diazoamino compounds.

The invention will be more fully set forth in the following more detailed description which includes examples that are given as illustrative embodiments of the invention and not as limitations thereof. Parts are expressed in parts by weight unless otherwise noted.

Example 1 A solution containing 18.9 parts by weight of the diazonium chloride of 4-chloro-2-amino toluene in 102 parts of water was made and diazotized in the customary manner by reacting 14.2 parts 4-chloro-2-amino toluene with 6.9 parts or sodium nitrite in a medium composed of 20.8 parts of 20 B. hydrochloric acid and 20 parts of water previously cooled to to 5 C. by adding 60 parts of ice. The diazo solution was clarified at 5 C. by stirring into it 3 parts of animal charcoal and 3 parts of "Filter-Gel" and then filterins.

The filtered solution was slowly added with stirring to a solution containing 21.2. parts 3- aminobenzene-sulfon-ethanol-amide in 150 parts Water at 0 to 5 C. Simultaneously a solution composed of 14 parts of solid anhydrous sodium carbonate and 50 parts of water was added at such a rate that the reaction mixture was maintained at an alkalinity indicated by deep red to brilliant yellow paper. The addition was completed in an hour, and stirring was maintained from one to three hours longer until the reaction was complete and free diazo compound no longer existed in the solution. The diazoamino compound thus formed was isolated by adding 60 parts of solid sodium chloride to the reaction medium, stirring for one-half hour and filtering. When dried in an oven at 55 C. the diazoamino compound was an orange-brown powder which was soluble in water and caustic solutions.

The product is represented by the formula CHI Example 2 To a solution of 31.2 parts 3-amino-benzenesulfon-tris(hydroxy methyDmethyl-amide and 20.5 parts of sodium acetate in parts of water at 0 to 5 C. was added a filtered solution composed of 18.9 parts of the diazonium chloride of 4-chloro-2-amino toluene in 102 parts of water prepared as described in Example 1. A solution of 11 parts of solid sodium bicarbonate in 50 parts of water was added over a period of one to two hours until the reaction solution was strongly alkaline to brilliant yellow paper. The solution was stirred for one to two hours longer until the reaction was complete, '75 parts of solid sodium chloride were added, and the mixture was stirred at 5 C. for one hour. The somewhat tarry diazoamino compound was removed by filtration, and dried in a vacuum oven at 55 C. The completely dry diazoamino product is a brown powder, but is tarry when moist. It is soluble in water and caustic solutions.

The product is represented by the formula Example 3 A solution of 21.6 parts of the diazonium chloride. of 4-nitro-2-amino anisole in 101 parts of water was prepared by reacting 16.8 parts of 4- nitro-2-amino-anisole with 6.9 parts of sodium nitrite in a medium composed of 20.8 parts of 20 B. hydrochloric acid and 20 parts of water which was cooled to 0 to 5 C. by adding 60 parts of ice. The diazo solution was clarified by stirring it with 3 parts of animal charcoal and 3 parts of Filter-Gel and filtering.

The filtered solution was added with stirring to a solution composed of 33.9 parts of l-amlnobenzene-2,4-di(sulfon-ethanol-amide) and 20.5 parts of sodium acetate in 100 parts of water. The mixture was maintained at 0 to 5 C. by external cooling. The solution was rendered strongly alkaline to brilliant yellow paper by the addition of 14 parts of solid sodium carbonate in 25 part of water. The mixture Was then stirred for one to three hours until the reaction was complete. The product was separated by adding 60 parts of solid sodium chloride and stirrin at 0 C. for one to three hours. The somewhat tarry diazoamino compound was removed by filtration and dried in a vacuum oven at 55 C. When completely dry, it is a brown powder, soluble in water and caustic solutions.

The product is represented by the formula Example 4 A solution containing 21 parts of the diazonium chloride of 2,5-dichloraniline in 153 parts of water was prepared by reacting 16.2 parts of 2,5-dichloraniline according to the usual diazotization procedures with 6.9 parts of sodium nitrite and '75 parts of 20 B. hydrochloric acid in 20 parts of water cooled to 0 to 5 C. by the addition of 60 parts of ice, The solution was clarified by stirring into it 5 parts of animal charcoal and 8 parts of Filter-Gel," and then filtering.

The filtered solution was slowly added to a solution of 56.3 parts of N-tris(hydroxy methyl)- methyl aniline 2,4-di [sulfon tris(hydroxy methy)-methyl-amidel in 100 parts of water at to C. Simultaneously. 31.8 parts of solid sodium carbonate were gradually added so as to maintain a strong alkalinity. The reaction was com leted by stirring from one to four hours at 5 C.. and then the solution was warmed to 55 C. and filtered. The filtrate was cooled externally with an ice-salt bath to 5" C.. 65 parts of solid sodium chloride were added, and stirring was continued for one to three hours. The tarry precipitate was isolated by filtration and dried in a vacuum oven at 55 C. The product is a low-melting amorphous substance, brown in color, and very soluble in water.

The product is represented by the formula c] C(CHgUH);

Or-NHC(CHH)3 Example 5 A solution containing 21.6 parts of the diazonium chloride of 4-nitro-2-amino anisole in 101 parts of water was prepared as described in Example 3.

The filtered solution was added to a solution of 42.5 parts of N-tris(hydroxy methyllmethylaniline 4 nitro 2 sulfon N tris(hydroxy methyl) methyl-amide in 100 parts of water, and the diazoamino product was formed and isolated as described in Example 3. The completely dry diazoamino is a brown powder, fairly soluble in water, and soluble in amixture of water and Cellosolve.

The product is represented by the formula $(CHIOBDS N=NN so,-NHc 011,011):

N0, Example 6 Example 7 A solution containing 18.9 parts of the diazonium chloride of 4-chioro-2-amino-toluene in 102 parts of water was prepared by the procedure described inExample 1.

The filtered solution was added to a solution of 31.1 parts of 1-amino-3-chloro-benzene-i-sulfontris(hydroxy methyllmethyl-amide. The reaction was completed and the product was isolated under the conditions similar to those described in Example 1. The dried product is a brownorange powder, soluble in water and Ceiiosolve," and in water and caustic.

The product is represented by the formula A diazoamino compound having similar properties is made in accordance with the foregoing example by using an equivalent of 1-amino-3- bromo benzene-l-suli'on-tris(hydroxy methyl) methyl-amide instead of the chloro substituted compound set forth therein.

Example 8 A solution containing 21.6 parts of the diazonium chloride of 4-nitro-2-amino anisole in 101 parts of water was prepared by the procedure described in Example 3.

The filtered solution was added with stirring to a solution composed of 30.3 parts of l-amino-benzene 3 (carbox-ethanol-amide) 5-(sulfon-ethanol-amide) dissolved in parts of water. The reaction and isolation were completed according to the procedure described in Example 3. The diazoamino compound thus obtained is a brown amorphous product, soluble in water and caustic.

The product is represented by the formula OCH;

The diazoamino compounds of the type described above are desirably prepared for printing purposes by incorporating them in pastes with water, "Celiosolve, sodium hydroxide, starchtragacanth gum and a coupling component. The following exemplary compositions of such pastes are expressed in terms of parts by weight.

Example 9 A printing paste was made by mixing Parts The diazoamino product described in Example 2 1.82 Ortho-toluidide of beta-oxy naphthoic acid 1.43 A sodium hydroxide solution containing 35 parts by weight solid sodium hydroxide in 100 parts of aqueous solution 3.0 "Cellosolve" 3.72 Water 15.03 Starch-tragacanth gum 75.0

The paste was applied to an engraved printing cylinder and the cylinder was pressed firmly onto cotton cloth so as to transfer the paste to the cloth in the engraved pattern. The cloth was then placed in a vapor-bath consisting of steam and acid vapors, such as vapors of formic or acetic acid. In the vapor bath, the diazoamino compound was split and the diazo component was liberated so that it immediately reacted with the coupling component present in the paste and developed the desired color upon the cloth. The dyeing was a beautiful bright red shade which was very fast both to light and to washing.

Example 10 A printing paste was made by mixing When applied to cotton cloth and treated as described in Example 9, the paste produced a deep brilliant red print which was very fast to light and to washing.

Example 11 A printing paste was made by mixing Parts The diazoamino product from the diazonium chloride of 2,5-dichlorani1ine with 1- ethylamino-benzene 2,4 dilsulfon-tris The print produced on cotton cloth with this paste was a full orange shade which was fast to light and to washing.

Example 12 A solution containing 33.8 parts of the tetrazonium chloride of dianisidine in 200 parts of water was prepared by reacting 24.4 parts of dianisidine with 13.8 parts of sodium nitrite in a medium composed of 41.6 parts of 20 B. concentrated hydrochloric acid and 100 parts of water which was cooled to to C. by the addition of 60 parts of ice. The diazo solution was clarified at 5 C. by stirring into it 3 parts of animal charcoal and 3 parts of Filter-Col and then filtering,

Th"- filtered solution was added slowly with stirring to a solution containing 94.6 parts of N-methylamino-benzene-2.4 di[sulfon-tris(hydroxy metliyl methyl-amidel in 300 parts of water at 0 to 5 C. Simultaneously a solution of 28 parts of solid anhydrous sodium carbonate in 150 parts of water was added at such a rate that the reaction mixture was maintained at an alkalinity.indicated by deep red to brilliant yellow paper. The addition was completed in an hour. and stirring was maintained for one to four hours longer until free diazo compound no longer was present in solution. The diazoamino compound was isolated by adding parts of solid sodium chloride to the reaction medium, stirring one-half hour and filtering. When dried in an oven at 55 C., the diazoamino compound was an orange-brown powder which was soluble in a mixture of water, caustic and Cellosolve."

The product i represented by the formula:

(J CH;

11 .c-mxm-OOmx-x-o in The diazoamino product may be utilized in a printing paste or the following composition:

Parts The diazoamino product from the tetrazonium chloride of dianisidine with N- methyi amino benezene 2,4-di[sulion tris(hydroxy methyl) methylamide] 12.12 The ortho-phenetidide of beta-oxy-naphthoic acid 3.08 A sodium hydroxide solution containing 35 parts by weight of solid sodium hydroxide in 100 parts of aqueous solution 4.0 Cellosolve" 3.8 Water 19.0 Starch-tragacanth gum 58.0

The print produced on cotton cloth with this paste, after exposure to steam-acetic acid vapors as previously described, was bright blue and had excellent fastness to light and to washing.

The proportions and kinds of compounds of the printing pastes can be widely varied. The nature of the solvent in the pastes may be varied considerably to allow for variations in solubility of the various alkylol-amide stabilizers and other solubilizing agents, dispersing agents and assistants. Any thickener can be used and the relative proportions thereof can be varied within wide limits so long as the paste has properties suitable to enable one to make prints with it on the fabric by the use of fabric printing appliances such as engraved rollers, printing blocks and the like. The diazoamino compounds stabilized solely with carboxy-alkylol-amides are considerably less soluble than those stabilized with the compounds containing at least one sulfon-alkylol-amide group, and consequently they require more capable solvents in the paste. Such a paste might contain alcohol, ethylene glycol, ethylene-glycolmonobutyl ether, a low molecular weight aliphatic hydroxyarnine, a quaternary ammonium type base or a mixture of such solvents. Dispersing agents suitable for incorporating into the paste are leukanol, aryl sulfonic acids, lecithin sulfonates and alkyl sulfates. The dispersing agents and solvents, such as Cellosolve" may be omitted in pastes containing the more soluble diazoamino compounds, such as the diazoamino compound of Example 4. The components of the dye to be produced may be present in the paste in equimolecular proportions or an excess of either one may be present. However, it is preferred that a small excess of the coupling component be present in the paste over that which is required to couple with the diazo of the diazoamino compound. For example, a desirable proportion is 1 mole of diazoamino compound to 1.1 mole of coupling component, or 1' mole of tetrazo- 9 amino compound to 2.2 moles of coupling component.

The diazoamino compounds of the present invention are especially advantageous in avoiding 10 carbonates 01' sodium and ammonium, such as ammonium carbonate, sodium carbonate and sodium bicarbonate are the preferred acid-binding agents for the preparation of the diazo-amino s ottiness in prints made with alkaline printing compounds. p te d in facilitating t Printing Where As illustrative of other compounds from which strength is desired. This is believed to be due are produced other suitable diazoaming comto the ab y to maintain in splution in the pounds of the invention which have the desirable alka e pa te a exceptionally hlgh cohcehtl'aproperties of those described and which are made tion of available diazo as compared for example, by combining them th t diazos of the class with diazoamino co p in Wh1ch the amlde described in the manner illustrated in the foreup is a a e f the aliphatic Seriesgoing examples are N-propyl-aniline-2,4-di[sul- Thu stabilized diazo compounds of the presfon tris(hydroxy methyl) me|;hy] amjde] 1 am1 ent lnvention may be pr duc from i no-benzene-3,5-di(sulfon-ethanol-amide), 4-nicomponent WhlCh is devoid of water-solubllizlng 5 tro N (beta hydroxy ethy1) ani1ine 2 s u 1 f groups, such as SUIITOHIC acid and carboxylic acid ethanohamide, bammmbenzenfizbdi(sulfmb groups; Typlcal prlmary arylammes from which diethanol-amide) l-amino-benzene-3-(carbox- S filazo compound? can be Produced diethanol-amide) -5-(sulfon-diethan0l-a mid e), llne lts homo10gues, its non-soluble substituted 1 (beta hydmxy ethyl) anmne 2 (carbx eth fi gi i h naPhthylallnines such i anol-amide) -5-(sulfon-ethanol-amide), l-butyl- .fatstsaasstt. assess... thl tetrazofizable dimni es methyl-am de] -4-[sulfon-tr1s(hydroxy methyl)- n methyl-amide], 1-amino-6-chlorobenzene-2,4-di- Numerous modifications may be made in the [carboptetrahydro b t 1) id 1 1 th 1 preparation of the diazoamino compounds. The xv u y e a min o-4-methyiol-benzene-2-[carbox-tetrahyessential of the reactlon is the condensatlon 1n droxy n butyn amide] 1 amino benzene 2 alkaline medium of a diazonium salt with a membe t h d b t I ber of a class of soluble primary or secondary car xetra y u ymmidehi'mulfon aminobenzene-acid-alkkylo1-amides which are tetrahydmxy'n'butyl'amide) l'methylammo's' 80 m e t h 1- b e n z e n e -2- [sulfon-(dimethanol) incapable of coupling with the diazo compound. y There is no essential Order in which the amide]-4-[carbox-(dimethanol)amide], l-ethponents of the reaction must be mixed in making i e t the dlazoamino compounds. The alkalinity may aIFOI'amIde and 1'ethanolammobenzene214-6 be produced by the addition of any acid-binding f agent. such as pyridine, the carbonate or bicar- 35 i g g examplesdare g of g bonate of ammonium, sodium or magnesium, or S a 1129 lazo compoun s W c were ma 9 n alkali metal hydroxides. Still other conditions of accordance with the Pmcesses hereinbefore the reaction may be widely varied, such as the i The resulting diazoamino compounds rate of mixing the constituents and the stirring 40 nd t e coupling components noted in these ex- It is important to maintain a low temperature p s w e us to m k Pri i past s simiuntil the diazo compound has completely reacted lar to th s h n f d s i dh pastes with the amino group of the stabilizer. Any low were pr nt d 0 Cotton fabric and d v ped temperature which is sufiicient to prevent exthereOn by acid ficat o producing the shades cessive decomposition of the diazo is satisfactory. noted. The diazoamino compounds of these ex- The preferred temperature of reaction is about 0 amples have the desirable properties of h cu to about 10 C. pounds of the foregoing examples.

Exflm- Dial, Com t St ut 0011 lin Com nent shade on me pollen B p 3 Cotton 13 dianisldine anlllde of beta hydroxy Navy blue.

naphtholc acid HO-CIHANESO OPNHCIHAOH i4 .do NH; p-pherletidi'ie of acetn- Golden yelaoeticacid low.

HociHiNHs0 OPNH-CaHtOH 1 cresidine NH-(hHq-OH tg-xtrgfig gg lfis Bordeaux.

O:NHC(CH:OH):

16 p-chlor-ortbo anisldl'ne NH-CIHI P83038352 WW- OINH-C(CHQOH)I :32 Dino Component Stabilizer Coupling Component :522: 1

21 -ehloro-2-toluldine NEE-04H o-toiidide of so ic-acetic Green yelaoid low. 0;--NHC(CH|0H)1 O,--NHC(CH1OH): I 28 l-benzoyl amino-2. Erdlethoxy NHC;H;OH luilide of beta hydroxy Blue.

aniline naphthoic acid Or-NH-CaHcOH 0:-NH0iH40 H J9 8 benzoylamlno 4 methory N H-C1HOH M-hloroq-tolldide of Violet aniline beta hfdroxy naphiholc ac d 0rNHC:H|OH

0rNHCzH(OH no bohloro-Z-nitro nni1ine. NHCH;OH m-nitrlnilide 0! beta Bed.

agg o! mphthdc Oa-NH-C :HAOH

Or-NH-CsHiO H 81 4-fnroyl-amlno-Z5-diotho1y NHC H.-.0H aniiide of beta hydro Blue.

aniline napli thoic acid x,

01-NH-C1H4OH BOz-NH-C lHIOH 82.-..-. 2,5-dlmethyl-4-ohlor aniline.-. NH-CaHoOH Z-methyl-B chIor-unilido Green yelol loeto acetic acid low.

Oa-NHCflI.OH

01-NH-CaH4OH 8-brom-6-methory-onlllno..-.. NH-CaHtOH Z-methyl-i'r'chlor-nnilide Do.

0! aoetoooetio acid Or-NH-QJROH Or-NH-CaHtO H This is a division of our copending application Serial No. 454.016.

We claim:

1. A diazoamino compound of the benzene series which is represented by the formula Biking R L 1k. ")n I wherein B is the radical of an ice-color diazo component which is devoid of water-solubilizing groups; R is one of a group consisting of hydrogen, alkyl having 1 to 4 carbons, hydroxyethyl and tris-'(hydroxymethyl)methyl; A is from a group consisting of SOzand CO; R is one of a group consisting of hydrogen and the alkylol groups having 1 to 2 carbons; R" is one 01' a group consisting of alkylol groups having 1 to 4 carbons and l to 4 hydroxy groups wherein wherein B is the radical of an ice-color diazo component which is devoid of water-solubilizing groups.

3. A dlazoamino compoufld rpresented by the cm CK: formula I 0011- cm. H Q --Ncwmom.

N=NILQSOPI!XQ(CH,OHJ' 5 ON o-nn-cmmom,

o-lr-cwmog CARL W. MAYNARD, JR. 0|

EMIL G. WIEST.

10 REFERENCES CITED 4. A diazoamlno compou d rep by the The following references are of record in the formula. file of this patent:

H UNITED STATES PATENTS c K632 $133323? 333225;? 522.11: 25. 3, 32%

m FOREIGN PATENTS 5. A dlazoamino compound represented by the Number Cguntry D t formula 44,229 The Netherlands Oct. 15, 1938 Certificate of Correction Patent No. 2,422,359: June 17, 1947. CARL W. MAYNARD, JR., ET AL.

It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows: Column 4, line. 47, Example 3, for 25 part read 25 parts; column 7, line 37, Example 11, before (hydroxy methyl) strike out tris; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 5th day of August, A. D. 1947.

LESLIE FRAZER,

First Assistant Uommz'ssz'oner of Patents.

3. A dlazoamino compoufld rpresented by the cm CK: formula I 0011- cm. H Q --Ncwmom.

N=NILQSOPI!XQ(CH,OHJ' 5 ON o-nn-cmmom,

o-lr-cwmog CARL W. MAYNARD, JR. 0|

EMIL G. WIEST.

10 REFERENCES CITED 4. A diazoamlno compou d rep by the The following references are of record in the formula. file of this patent:

H UNITED STATES PATENTS c K632 $133323? 333225;? 522.11: 25. 3, 32%

m FOREIGN PATENTS 5. A dlazoamino compound represented by the Number Cguntry D t formula 44,229 The Netherlands Oct. 15, 1938 Certificate of Correction Patent No. 2,422,359: June 17, 1947. CARL W. MAYNARD, JR., ET AL.

It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows: Column 4, line. 47, Example 3, for 25 part read 25 parts; column 7, line 37, Example 11, before (hydroxy methyl) strike out tris; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 5th day of August, A. D. 1947.

LESLIE FRAZER,

First Assistant Uommz'ssz'oner of Patents. 

